Pump



Aug. 27, 1940. F T, ,RGENS Y 2,212,939

PUMP,

Filed Aug. 5, 193s Y O lo) //J p55* FINNmTLyEgSNS ATTORNEYS,

LLM@ M2 Patented Aug. '27,' 1940 UNITED STATES Finn T. Irgens, Wauwatosa, `Wis., assigner to Outboard Marine & Manufacturing Company, Milwaukee, Wis., a corporation of Delaware Application August 5, 1938, Serial No. 223,167 6 Claims. (Cl. 10S-132) This invention relates to improvements in pumps. for outboard motor usage.

It is the object of the invention to provide a l novel, simplified, and inexpensive pump with a positive means of displacing the liquid pumped and yet a displacement member which/will not be` damaged by foreign matter in such liquid.l

More particularly stated, it is proposed to' provide a pump of the rotary displacement type with,

a gyratory piston or displacement member coniposed of a single piece of rubber or rubber substitute held by its own elasticity under compression in the pump chamber` and sufciently deformable in the presence of foreign matter such as pebbles or sand so as to expel such foreign matter through the pump without damage to any of the parts thereof.

It is a further object of the invention to provide a novel and improved pump chamber structure specifically designed for outboard motor usage.

In the drawing: Fig. 1 is a fragmentaryv view inside elevation of ak portion of the lower unit of an outboard motor having unitarlly attached and incorporated `thereina pump casing and pump embodying this invention. Y

Fig. 2 is a detail view in axial section on an 90 enlarged scale through, the pump casing portions of the outboard motor.` structure shown in Fig. 1-

Fig. 3 is a detail view taken in section on the line 3--3 of Fig.l 2. Y Fig. 4 is a detailyiew taken in section on the line 6 4 of Fig. 3.

Like parts are identified by the same reference characters throughout the several views.

The outboard motor lower unit 5'shown in Fig.

1 is provided internally with a gear casing 6 in which are disposed the pinion 'l and gear 8V for driving the propeller shaft 9. The general arrangement is conventional, although the gear casing 8 has been very much shortened to provide for the attachment at the -rear of the outboard motor lower unit 5 of the special closure element I I) and pump casing section II, both of elements I0 and being held in assembly to`the rest of the lower unit by means of the bolts. I2. The i sectional construction 'as above described enables .50 convenient access to .the gear casing 6', nevertheless leaving the pump runner unusually accessible between the casing element II and the closure member I0 on the outside of the packing employed for the propeller shaft 9.

The closure sectionllii provides a bearing I4 and bushing I5 for the propeller 'shaft 9. Externally of the bushing the packing lements I8 and I'lare seated about the shaft in a recess in the sectional unit III as a seal to prevent the do escape of grease from the gear casing and te It has particular reference to a pump prevent the access of water thereto. 'In the upper part of unit I0 'is the delivery chamber I8 of the pump from which the usual w'ater supply pipe I9 leads to the cooling jacket of the engine.

lExternally of closure section I0 shaft 9 carries- 5 an eccentric 28 which operates Within a gyratory displacement piston 2| restrained against rotation by' an integral lug 22 which projects from its periphery. Concentric with its bearing on the eccentric 28, thevpiston 2| is provided with peripheral grooves 23, these constituting a preferred meansof providing for the deformation of the piston under load. 1 y

The gyratory piston 2| is preferably made of rubber or some other substitute such as Neoprene, l5

' Neoprene being preferred for the reason that it is resistant to oil. The pump casing section I I is cup-shaped, being provided with a generally cylindrical pump chamber at 25, wit a water inlet at 26 and an outlet at 2l in tothe chamber 20 28 which communicates'along .the upper b'olt I2 .with the` discharge chamber I8 ofthe pump.

One side wall of chamber 25 is provided by the sectionJII and the other side wall A,is provided by section I8, the exible and elastically deform- 25 able displacement body orpiston 2| being conned in chamber 25 under slight pressure upon the tightening of )the retaining bolts I2.

The integral lug -22 of the piston is confined between one side of the outlet port 28 anda wall 30 member 29 so that the piston cannot rotate but is free to gyrate as the eccentric 20 moves it during the rotation of the propeller shaft 9.

The opening-at 30 in the pump casing section lII through which shaft 9 projects has suflicient 33- clearance so that the water in which the .propeller `3| operates vis freely admitted along the shaft to the central part of the pump chamber 25. 'I'hus the bearing between the eccentric 20 sj and the hubl portion of the gyratory piston 2| 4Q is water lubricated, and the bearing surfaces between the side walls of casing 25 and the side.

faces of the gyratory piston 2| are likewise water lubricated.

The opening 26 may be screened if desired, but 45' ladjacent Athe discharge port 21, being either deposited in the settling chamber I8 or carried upwardly through lpipe I9 with the stream of water delivered by the pump..Y The channels 23 in the faceof the pisto'nfpern'iit` the piston to be 55 deformed by extraneous bodies mcre readily than would be the case if the piston were not channeled or otherwise relieved.

Thus, the structure is one which provides pos-l itive circulation ofthe liquid pumped, while at 0o the same time freely passing foreign objects which would destroy the ordinary piston circulating pump. Notwithstanding these advantages the structure is exceptionally inexpensive and easy to produce and assemble.

I claim:

l. A device of the character described, comprising a casing section having a bearing face and p rovided with a shaft bearing opening to said face and a.discharge chamber likewise opening to said face, a complementary casing section provided with a bearing face opposing the face of the first mentioned section and provided with a side wall enclosing apump chamber between said bearing faces, a shaft in the shaft bearing, an eccentric on said shaft, an elastically deformable displacement piston journaled on the eccentric and confined between the opposing bearing faces of the respective sections, means connected with one of said sections for restraining said piston against rotation while permitting it gyratory movement on said eccentric, said piston being cut away to provide relief for increasing its flexibility in the presence of a foreign body in said pump chamber, said pump chamber communidating with said rst mentioned chamber for thedischarge of fluid pumped and being provided with an inlet for such fluid.

2.'. The combination with a hollow casing comprising an end wall provided with a cavity opening through' said wall independent of the casing and with `a bearing opening through said wall and communicating with-sa-id casing, of va shaft; pro- I jecting from said casing through said bearing, an eccentric on said shaft externallyv of said wall, a displacement pump member operatively mounted about the eccentric to receive motion therefrom, said member bearing on said wall and being provided with a projecting tab, and a chamber element seated against said casing end wall and having a chambered portion within which said member is fitted and enclosed and having an outlet passage portion extending from said chambered portion to cover that part of said wall through which said cavity opens.

3. The combination with a hollow casing comprising an end wall having a bearing opening through said 'wall communicating with the casing and a discharge opening through said wall, said wall being provided with a discharge cavity independently of said casing and with which said discharge opening communicates, of a shaft projecting from said casing through'said bearing, an eccentric on the shaft externally of the wall, a displacement pump member operatively mounted on the eccentric to receive motion therefrom, said I member .bearing on the wall` and being provided with a projecting tab, anda chamber element 'seated against the casing wall and having a chambered portion within which said member is tted and enclosed, said chamber element having a discharge passage communicating through the discharge opening of the wall with the discharge cavity aforesaid and provided with means engaging said tab for restricting said displacement member against rotation while permitting it to move upon the eccentric, and means for fastening said chamber element to said wall including a bolt extending through said discharge passage, said discharge opening, and said cavity.

4: The combination with a hollow casing opening at its end, of a wall closure forsaid casing provided with a cavity independent of the casing and-alsol provided with a bearing opening into said casing, said wall having an outwardly disposed plane face, a 'shaft projecting through said bearing from said casing, an eccentric mounted onsaid shaft externally of said wall 5 chamber element seated against the casing clos- 10 ure wail and having a chambered portion within which said member is fitted and enclosed, an outlet passage opening radially from said chambered portion and extending along said wall, said tab projecting into a part ofsaid passage, means in 15 .said passage engaging said tab, whereby to secure said displacement member against rotation while permitting it freedom of movement upon s id eccentric, and bolts extending through said cha ber element and said closure into said casing and 2 0 constituting means for holding said element closure and casing in assembly, one of s'aid bolts extending through the outlet passage of said chamber element, said wall having a port affording communication between said passage and said 25 cavity and throughwhnichsaid boltxtends.

5. The combination with a casing having" an end wall provided with a cavityopening through said wall, of a shaft projecting from the casing, an eccentric mounted on the shaft, a pump eiement mounted onthe eccentric, a cup-shaped chamber element confining said pump element andprovicied with a pump chamber substantially concentric with lth 'shaft and witli an' intake passage opening from the exterior and a discharge passage constituting an enlargement of said chamber communicating through said wall with said cavity, partition vane means exibiy connecting said pump element and said chamber element for cutting off direct communication between said passages while accommodating orbital movement of said pump element on said eccentric, and means detachably connecting said chamber element with said casing.

6. The combination with an outboard motor gear casing having an end wall provided with an internal cavity opening through said wall, of a propeller shaft disposed withiny said gear casing and projecting therefrom through said wall below said cavity and opening, said wall having an a external face with an upwardly elongated portion above said shaft through which said cavity opens, an eccentric mounted on the shaft, a pump element mounted on the eccentric, a cup-shaped.

chamber element confining said pumpelement u y pump element on said eccentric, and means detachably connecting said chamber element with said casing, said propeller shaft' projecting beyond said chamber element from said casing.

- FINN T. IRGENS. 

